Favor ARM hardfloat over ARM softfloat calling convention. In
particular, this solve the problem of the raspbian distribution where
the softfloat ld.so pathname (lib/ld-linux.so.3) is actually a symlink
to the hardfloat ld.so pathname (/lib/arm-linux-gnueabihf/ld-2.13.so).
Fix overflow detection for R_ARM_CALL, R_ARM_PC24, R_ARM_JUMP24 and
R_ARM_PLT32 relocations on ARM. 26 bits means 25 bits for positive and
negative offsets !
gcc fails the builtin_frame_address test on ARM so we disable it. As a
consequence, the diff between gcc and tcc's output is unecessarily
bigger. Given the big size of the diff currently, this doesn't make a
big difference but may allow to detect a regression in tcc's
implementation of builtin_frame_address.
Change the linking of the frames on ARM. Instead of having fp points 12
bytes above where the old fp is stored, let fp points where the old fp
is stored. That is, we switch from:
| . |
| . |
| . |
| |
| params | <-- fp
--------
| oldlr |
--------
| oldip |
--------
| oldfp |
--------
to:
| . |
| . |
| . |
| |
| params |
--------
| oldlr |
--------
| oldip |
--------
| oldfp | <-- fp
--------
Indirect functions shall have STT_FUNC type in executable dynsym
section. Indeed, a dlsym call following a lazy resolution would pick the
symbol value from the executable dynsym entry. This would contain the
address of the function wanted by the caller of dlsym instead of the
address of the function that would return that address.
This commit revert commit 061b5799cc and
subsequent commits to detect whether -Wno-unused-result is supported or
not by the compiler used to compile tcc. No warning about unused results
is issued in a normal build and thus this switch is only needed if
calling make with extra switches in CFLAGS or CPPFLAGS. It should thus
be added with the extra switches when calling make and not in the
Makefile.
A line in gfunc_call in arm-gen.c is referencing vfpr unconditionally.
Yet, this function is only available when TCC_ARM_VFP is set. While this
code is only triggered when TCC_ARM_VFP, it fails at compile time. This
commit fix the problem.
TCC_ARM_EABI should be defined when compiling with hardfloat calling
convention. This commit rework the Makefile to distinguish between
calling convention and multiarch and define TCC_ARM_EABI when hardfloat
calling convention is used. The result is to first guess the calling
convention and then add the multiarch triplet if necessary.
Revert commit 891dfcdf3f since it assumes
*all* architectures supported by tcc have GOT offsets aligned on 2. A
rework of this commit is being done since without it all PLT entries
grow by 4 bytes.
Since commit c6630ef92a, Call to a veneer
when the final symbol to be reached is thumb is made through a blx
instruction. This is a mistake since veneers are ARM instructions and
should thus be called with a simple bl. This commit prevent the bl ->
blx conversion when a veneer is used.
Source fortification now works correctly : it compiles without warning
except unused result and the resulting tcc is working fine. Hence let's
stop disabling source fortification and hide unused result instead.
Generate PLT thumb stub for an ARM PLT entry only when at least one
Thumb instruction branches to that entry.
Warning: To save space, this commit reuses the bit 0 of entries of
got_offsets array. The GOT offset is thus saved in a 31 bit value.
Make sure to divide by 2 (right shift by 1) an offset before storing it
there and conversely to multiply the value by 2 (left shift by 1) before
using it.
the absence of a clean target in tests2/Makefile make the clean target
in the main Makefile fails to complete. This commit create such a target
which removes the only file created when tests pass successfully.
Add support for relocations R_ARM_THM_JUMP24 and R_ARM_THM_CALL. These
are encountered with gcc when compiling for armv6 or greater with
-mthumb flag and a call (conditional or not) is done.
Currently, VLA are not forbidden for static variable. This leads to
problems even if for fixed-size array when the size expression uses the
ternary operator (cond ? then-value : else-value) because it is parsed
as a general expression which leads to code generated in this case.
This commit solve the problem by forbidding VLA for static variables.
Although not required for the fix, avoiding code generation when the
expression is constant would be a nice addition though.
Introduce ARM version for the target architecture in order to determine
if blx instruction can be used or not. Availability of blx instruction
allows for more scenarii supported in R_ARM_CALL relocation. It should
also be useful when introducing support for the R_ARM_THM_CALL
relocation.
With R_ARM_CALL, if target function is to be entered in Thumb mode, the
relocation is supposed to transform bl in blx. This is not the case
actually so this commit is there to fix it.
Add support for relocations R_ARM_MOVW_ABS_NC and R_ARM_MOVT_ABS as well
as their Thumb2 counterpart R_ARM_THM_MOVW_ABS_NC and
R_ARM_THM_MOVT_ABS. These are encountered with gcc when compiling for
armv7-a and a data is loaded in a register, either in arm or Thumb2
mode. The first half of the data is loaded with movw ; the second half
is loaded with movt.
Arm hardfloat variant uses a different ABI than arm and uses thus a
different multiarch directory for headers and libraries. This commit
detect whether the system uses the hardfloat variant and configure the
multiarch directory accordingly.
Evaluate configure arguments to reproduce autotools behavior. Autotools
actually only expands a few variable and do it at make time but it makes
the change much simpler.
* Add multiarch directories for arm and i386
* Fix detection of biarch: /lib64/ld-linux-x86-64.so.2 is mandated by
ABI and is thus always present, even if there is no biarch
* Define CONFIG_LDDIR directly with the right value in case of multiarch
instead of defining it to /lib and then redifining it.
This patch fix 2 bugs in CONFIG_LDDIR usage:
* CONFIG_LDDIR used for 2 purposes
there is confusion between the directory to find libraries, crt* files
and headers and the directory in which the program interpreter is.
These two directories are not related. The latter is specified by the
ABI and should not be configurable while the former depends on the
system (single arch, biarch, multiarch). This end a longstanding issue
with amd64 program interpreter later propagated to other architecture
interpreters.
* If multiarch is in effect, then the library directory should be /lib.
/lib64 denotes biarch architecture, everything which is here would be
in /lib/x86_64-linux-gnu instead.
This reverts commit 1c11b857fe.
On windows, libtcc.c is compiled with ONE_SOURCE and then tcc.c is
linked to it. Thus tcc.c can only use public functions which cstr_* are
not.
elements in linker_arg are used in TCCState structure and must thus not
be freed when option parsing is finished. Declare linker_arg as a global
static variable and free it after tcc_delete has been called on TCCState
structure.
This fix commit 7fb0482a46
ld support arguments to multiple-letter options being passed in two
ways:
* -opt=arg
* -opt arg
libtool generate command line of the second form. This commit add
support for the second form so that libtool works with tcc. The way it
is done is to concatenate all -Wl options into one and then pass it to
set_linker.
Remove the previous logic to link a named file with a loader script by
using tcc_add_dll instead. Hence, all files can be linked, not only
files ending in .so/.def.
Thomas Preud'homme